JPH10243583A - Motor, image recorder and optical scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase rigidity of a coil and reduce a noise having a frequency of (revolution × number of poles) by a method wherein the coil is directly applied to a magnetic layer-built plate and, further, the coil and the plate are molded integrally with resin to form a pedestal which is fixed to a housing. SOLUTION: A magnetic layer-built plate 9 to which a coil 8 is applied beforehand is inserted into a mold. Then the mold is filled with photocuring resin and the resin is cured by the application of a light to fix the coil 8 and the magnetic layer-built plate 9 to each other. As the surroundings and interstices of the coil 8 and the magnetic layer-built plate 9 are filled and solidified with the photocuring resin, the coil 8 and the magnetic layer-built plate 9 are unified and the rigidity of the coil is improved. Further, a core pedestal 7 composed of the unified coil 8 and magnetic layer-built plate 9 is fixed to a housing 2 with bises, etc. With this constitution, the vibration of the coil 8 which is caused by the attraction/repulsion by the poles of driving magnets at the time of rotation is avoided and a noise having a frequency of [(revolution)×(number of driving magnet poles)] can be eliminated, so that a silent scanner motor can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus using a light beam such as a motor such as a scanner motor for driving a rotary polygon mirror for scanning a light beam on a photoreceptor, a laser printer, a digital copying machine or the like. And an optical scanning device for deflecting and scanning a light beam.

[0002]

2. Description of the Related Art Conventionally, for example, an optical scanning device for deflecting and scanning a light beam is provided with a scanner motor for rotating a polygon mirror for scanning the light beam. This scanner motor is configured as shown in FIG. That is, the rotating shaft 101 is rotatably fixed to the housing 103 via the ball bearing 102. In addition, the fixed member 10 is attached to the rotating shaft 101.
4, the drive magnet 105 is fixed by bonding or the like. A coil 107 wound around a bobbin 106 is provided at a position facing the drive magnet 105, and a magnetic laminated plate 108 is provided on the outer periphery thereof.

A rotating polygon mirror 109 is fixed on the fixing member 104 by an elastic member 110.

The housing 103 is fixed to a case (not shown) in which the present scanner motor is mounted by screws or the like.

[0005]

However, in the above-mentioned conventional example, since the coil 107 is wound around the bobbin 106, there are the following problems. That is, since the rigidity of the coil 107 is insufficient, the driving magnet 10
As the magnetic pole 5 rotates, the coil receives an attractive / repulsive force due to the change of the magnetic pole, and vibrates.

[0006] Such vibrations appear as noise during the rotation of the rotor. The frequency f of the noise is a number obtained by multiplying the number of rotations N of the scanner motor by the number of poles P of the drive magnet 105. For example, if the rotation speed is N = 10000 rpm and the number of poles is P = 8, the frequency of the noise is f = 1.
3 kHz.

[0007] Such noise tends to increase as the rotation of the scanner motor increases, because the rigidity of the coil becomes insufficient.

SUMMARY OF THE INVENTION An object of the present invention is to provide a quiet motor, an image recording apparatus, and an optical scanning apparatus in which noise having a frequency of (number of rotations) × (number of poles) is reduced by increasing the rigidity of a coil. It is in.

[0009]

SUMMARY OF THE INVENTION The present invention is a motor comprising a rotating rotor and a stator provided outside or inside the rotor, wherein the motor faces a driving magnet attached to the rotor. A motor is formed by providing a combined body in which the magnetic laminated plate at the position and the coil wound around the magnetic laminated plate are fixed and integrated with a resin, and the combined body is attached to the base member of the stator.

Here, the coupling body can be directly fixed to the base member of the stator.

The magnetic laminate and the coil can be integrally formed using a photo-curable resin, or can be integrally formed using a thermoplastic resin or a thermosetting resin.

The present invention also relates to an image recording apparatus provided with a rotary polygon mirror for scanning a light beam on a photoreceptor, wherein the motor for rotating and driving the rotary polygon mirror has the coupling unit. Can be used to configure an image recording apparatus.

The present invention also relates to an optical scanning device having a rotary polygon mirror for deflecting and scanning a light beam, wherein the optical scanning device uses the motor having the combination as a motor for rotating the rotary polygon mirror. The device can be configured.

[0014]

Embodiments of the present invention will be described below in detail.

A first embodiment of the present invention will be described with reference to FIGS.
It will be described based on. In this example, a scanner motor for rotating a rotary polygon mirror for scanning a light beam on a photoconductor is used as an example of the motor. First, the overall configuration of the scanner motor will be described with reference to FIG.

Reference numeral 1 denotes a rotating shaft constituting the rotor side.
Reference numeral 2 denotes a housing (base member) constituting a stator side for mounting the present scanner motor to a case (not shown). Reference numeral 3 denotes a ball bearing for rotatably attaching the rotating shaft 1 to the housing 2. Reference numeral 4 denotes a seat surface to which the rotating shaft 1 is attached by a known technique such as press fitting. 5
Is a driving magnet attached to the seating surface 4 by a known technique such as bonding, and the driving magnet 5 is made of a permanent magnet having a plurality of magnetic poles in a circumferential direction.

Further, a rotary polygon mirror 6 for scanning the laser beam is mounted on the upper part of the seat surface 4, and the rotary polygon mirror 6 is fixed by an elastic member 6a.

In the outer circumferential direction of the driving magnet 5,
A core base (combined body) 7 is fixed to the housing 2 at a position facing this by means of a known technique such as screwing.
The core base 7 is made of a photocurable resin, and includes a magnetic laminate 9 in which a coil 8 is wound. In addition,
The housing 2 to which such a core base 7 is fixed is on the stator side.

Next, a method of manufacturing the core base 7 including the coil 8 and the magnetic laminate 9 will be described.

As shown in FIG. 2, first, the coil 8 is wound around the magnetic laminate 9 in advance. Then, the magnetic laminate 9 around which the coil 8 is wound is inserted into the mold 10. Thereafter, as shown in FIG. 3, the mold 10 is filled with a photocurable resin 11, and is further hardened by applying light 12. Thereby, the coil 8 and the magnetic laminate 9 can be fixed.

At this time, since the photo-curing resin is filled and hardened around the coil 8 and the magnetic laminated plate 9 and even in the gap, the coil 8 and the magnetic laminated plate 9 are integrated and the coil 8 is formed.
The stiffness is greatly enhanced.

Thus, the coil 8 does not vibrate due to being attracted and repelled by the magnetic poles of the drive magnet 5 during rotation, and noise having a frequency of (number of rotations) × (number of poles of the drive magnet) can be eliminated. It is possible to provide a quiet scanner motor.

The coil 8 and the magnetic laminate 9 are made of resin 1
In order to form a hole for fixing the core base 7 integrated in 1 to the housing 2 with screws or the like, a projection is provided on the mold 10, and the shape of the mold 10 can be freely adjusted according to the shape of the housing. You can decide.

In addition to the mold 10 and the magnetic laminate 9,
For example, an external element such as a current phase switching Hall element may be inserted and molded integrally.

In this embodiment, a so-called inner rotor type scanner motor having a coil disposed outside the drive magnet 5 has been described. Conversely, a so-called outer rotor side in which the coil 8 is disposed inside the drive magnet 5 is described. It may be a scanner motor.

The material of the core base 7 is not limited to a photo-curable resin, but is, for example, a resin of a two-liquid mixture type having a rigidity equal to or higher than that of a general resin (for example, ABS). Anything is fine.

In this embodiment, a scanner motor in an image recording apparatus such as a laser printer or a digital copier has been described as an example. However, the present invention is not limited to this, and for example, an optical scanning apparatus having a function of deflecting and scanning a light beam. Applicable to

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described based on.

FIG. 4 shows a method of manufacturing the core base 7 including the coil 8 and the magnetic laminate 9. The core base 7 of this example is not made of a photocurable resin, but made of a thermoplastic or thermosetting resin. Reference numeral 13 denotes a mold for molding the core base 7 by injection molding. Note that the other configuration is the same as that of the above-described first embodiment, and the description is omitted.

The coil 8 is inserted into the mold 13 while being wound on the magnetic laminate 9 in advance. Thereafter, the core base 7 is formed integrally with the coil 8 and the magnetic laminate 9 by so-called insert molding in which resin is filled from the sprue and the runner 14.

Manufacturing by insert molding as in the present example is widely and generally performed, and a large number of types of thermoplastic or thermosetting resins can be used. Can be. In addition, since such manufacturing can shorten the molding cycle, it can be excellent in mass productivity.

[0032]

As described above, according to the present invention,
The coil is wound directly on the magnetic laminate, and further solidified with resin to form a pedestal (combined body), and the pedestal is fixed to the housing, so that the rigidity of the coil can be increased.
As a result, the drive magnet does not vibrate due to the attraction / repulsion force, and noise having a frequency of (number of rotations) × (number of poles) is eliminated, and a quiet motor can be realized.

Further, since the pedestal to be fixed to the housing can be formed into a predetermined shape by using the resin, the degree of freedom of design can be increased and a quieter motor can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a scanner motor according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a core base at the time of manufacturing constituted by directly winding a coil on a magnetic laminate.

FIG. 3 is an explanatory diagram illustrating a method of manufacturing a core base.

FIG. 4 is a cross-sectional view for explaining a method of manufacturing a core base according to a second embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a configuration of a conventional scanner motor.

[Description of Signs] 1 Rotor (rotating shaft) 2 Stator (base member) 5 Drive magnet 7 Combined body (core base) 8 Coil 9 Magnetic laminated plate

Claims (6)

[Claims] 1. A motor comprising a rotating rotor and a stator provided outside or inside the rotor, wherein the magnetic laminated plate is located at a position facing a drive magnet attached to the rotor, and A motor, comprising: a combined body in which a coil wound around a laminated plate is fixed and integrated with a resin, and the combined body is attached to a base member of the stator. 2. The motor according to claim 1, wherein the coupling body is directly fixed to a base member of the stator. 3. The motor according to claim 1, wherein the magnetic laminate and the coil are integrally formed using a photo-curable resin. 4. The motor according to claim 1, wherein the magnetic laminate and the coil are integrally formed using a thermoplastic resin or a thermosetting resin. 5. An image recording apparatus provided with a rotary polygon mirror for scanning a light beam on a photosensitive member, wherein a motor for rotating the rotary polygon mirror is driven. An image recording apparatus using the motor described above. 6. An optical scanning device comprising a rotary polygon mirror for deflecting and scanning a light beam, wherein the motor according to claim 1 is used as a motor for rotating and driving said rotary polygon mirror. An optical scanning device, comprising: